Onopordum illyricum

Linnaeus

Sp. Pl. 2: 827. 1753.

Common names: Illyrian thistle
WeedyIntroducedIllustrated
Treatment appears in FNA Volume 19. Treatment on page 88. Mentioned on page 87.

Plants 50–250 cm, herbage canescent-tomentose throughout. Stems: wings 0.5–2 cm wide. Leaves 10–50 cm, margins shallowly to ± deeply 1–2-pinnatifid with 8–10 pairs of triangular lobes. Heads mostly borne singly at branch tips. Involucres 30–60 mm diam (excluding spines) ± spheric, bases truncate to concave. Phyllaries lanceolate to ovate, bases 3–8 mm wide, glabrous or ± cobwebby-tomentose, spines to 5 mm. Corollas purple, 25–35 mm. Cypselae 4–5 mm; pappi of many whitish, plumose bristles 10–12 mm. 2n = 34 (France).


Phenology: Flowering summer (Jun–Aug).
Habitat: Grasslands, fields, roadsides, oak woodlands
Elevation: 200–500 m

Distribution

V19-37-distribution-map.gif

Introduced; Calif., s Europe (Mediterranean region), in Australia

Discussion

Illyrian thistle is considered to be a noxious weed in California where efforts to eradicate it from the state’s flora have been implemented. This species has also invaded rangelands in Australia, where it is introduced.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Onopordum illyricum"
acute-tailed +
rounded;acute +
scarious +
indeterminate +  and determinate +
David J. Keil +
Linnaeus +
cobwebby-tomentose +  and glabrous +
truncate +  and concave +
3mm;8mm +
Asteraceae tribe Cynareae +
compound +  and simple +
10-nerved or 20-nerved +  and rugose +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Illyrian thistle +
zygmorphic +  and actinomorphic +
purple +  and white +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
4-5-angled +  and cylindric +
fertile +  and bisexual +
Calif. +, s Europe (Mediterranean region) +  and in Australia +
200–500 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grasslands, fields, roadsides, oak woodlands +
indeterminate +
canescent-tomentose +
each +  and sessile +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
sessile +  and winged-petiolate +
cauline +  and basal +
10 cm100 mm <br />0.1 m <br /> (?) +  and 50 cm500 mm <br />0.5 m <br /> (?) +
deltate +, usually narrowly triangular +  and more or less linear +
divided +  and lobed +
2-carpellate +
1-2-pinnatifid +
persistent +
Flowering summer (Jun–Aug). +
reflexed +  and spreading +
outer +  and middle +
fringed +
papillate +  and smooth +
distinct +  and fused +
papillate +
cylindric +
flat;convex +
exalbuminous +
Weedy +, Introduced +  and Illustrated +
spiny-winged +  and branched +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
Compositae +
Onopordum illyricum +
Onopordum +
species +
goblet--shaped +  and cylindric +
slender +
50 cm500 mm <br />0.5 m <br /> (400 cm4,000 mm <br />4 m <br />) +
0.5cm +  and 2cm +